1215023425 has 24 divisors (see below), whose sum is σ = 1878397632. Its totient is φ = 757416000.

The previous prime is 1215023423. The next prime is 1215023441. The reversal of 1215023425 is 5243205121.

It is not a de Polignac number, because 1215023425 - 2¹ = 1215023423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1215023425.

It is not an unprimeable number, because it can be changed into a prime (1215023423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 313666 + ... + 317515.

It is an arithmetic number, because the mean of its divisors is an integer number (78266568).

Almost surely, 2^1215023425 is an apocalyptic number.

It is an amenable number.

1215023425 is a deficient number, since it is larger than the sum of its proper divisors (663374207).

1215023425 is a wasteful number, since it uses less digits than its factorization.

1215023425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631209 (or 631204 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1215023425 is about 34857.1861314134. The cubic root of 1215023425 is about 1067.0748489347.

Adding to 1215023425 its reverse (5243205121), we get a palindrome (6458228546).

The spelling of 1215023425 in words is "one billion, two hundred fifteen million, twenty-three thousand, four hundred twenty-five".